Solving my engine hesitation

2006 CHEVROLET AVEO
205,500 MILES • 3.8L • 4 CYL • FWD • MANUAL
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DR_ELGAMMAL2010
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Around six months before during stopping in traffic signals after that i start to running the problem happened which is stalling, hesitation, loss of power so i need to stop at side way to check but found nothing. This takes a seconds and run. And recurring after that periodically. I changed spark plugs and wires, ignition coil, fuel pump, fuel filter, cleaned injectors, air filter, throttle body cleaned with carburetor cleaner, and lastly replaced TPS sensor.

Sorry for long complaint.
I trust your website so hopefully helping me to solve that problem
Thanks in advance
Mar 22, 2017 at 8:21 PM
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HMAC300
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check your fuel pressure first it should be 55-62 psi with key on only then watch gauge and it should not decrease more than 5 psi in 2 minutes. if it does pump is no good. also clean throttle plate once again on both sides and iac hole. clean well around shaft as the tps connects to that and it gets gummy. check for a vacuum leak as well hoses, cracked broken off etc. finally scan for codes auto parts does for free . One other thing check to make sure duct work from air cleaner to throttle has no holes or is on correctly.
Mar 23, 2017 at 6:10 AM
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DR_ELGAMMAL2010
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Thanks in advance,
I found vacum leak through hoses and also a loose sensor connector on manifold. Just fix that connector hesitation stopped. But to be honest i wait for the next days to follow that problem.
I will add my notes for help soon.
Much thanks for all
Best Regards.
Mar 23, 2017 at 12:40 PM
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STRAILER
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HMAC300 is one of our best!

Please let me know if you need anything else to get the problem fixed.

Best, Ken
Mar 27, 2017 at 4:02 PM
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DR_ELGAMMAL2010
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Thanks for all
My car enegine started hesitation, at that time I separated the connection to MAP sensor and founded hesitation stopped So i changed that sensor. Now it is fine but again i will follow the car for next days.
Thanks for 2carpros admins
Best Regards
Reda Mohamed
Mar 27, 2017 at 9:40 PM
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DIRTYFEET
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Engine Performance problem
2005 Chevy Aveo 4 cyl Front Wheel Drive Automatic 85000 miles

Upon normal acceleration car misses and
hesitates,feels as though it is not getting
ample fuel supply. At times (merging onto interstates as example) with stronger
exceleration the "hold" lite comes on and flashes, come to a complete stop it goes off. Also most recently, while excelerating car does not gain speed for several seconds. Diagnosed with no codes given while mechanic had it and ran good for them. Running consitantly terrible now, dealer says vehicle does not have a fuel filter?
Mar 28, 2017 at 9:58 AM (Merged)
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RASMATAZ
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Possible Causes of Engine Hesitating or Stumbling


Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
Mar 28, 2017 at 9:59 AM (Merged)